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@ARTICLE{Durmus:826404,
author = {Durmus, Yasin Emre and Aslanbas, Özgür and Kayser,
Steffen and Tempel, Hermann and Hausen, Florian and de
Haart, L. G. J. and Granwehr, Josef and Ein-Eli, Yair and
Eichel, Rüdiger-A. and Kungl, Hans},
title = {{L}ong run discharge, performance and efficiency of primary
{S}ilicon–air cells with alkaline electrolyte},
journal = {Electrochimica acta},
volume = {225},
issn = {0013-4686},
address = {New York, NY [u.a.]},
publisher = {Elsevier},
reportid = {FZJ-2017-00632},
pages = {215 - 224},
year = {2017},
abstract = {Si–air batteries, unlike other resource efficient
metal–air batteries that were subject of investigations
for quite a long time, came to the focus of research only
recently. When operated with alkaline electrolyte, severe
limitations of the discharge capacities were reported, which
were attributed to a passivation layer on the anode. As a
consequence, only small fractions of the surface from
Si-anodes could be used for discharge. The objective of the
present work is to reconsider the discharge behavior of
Si–air cells with KOH electrolyte and to point out how a
discharge process can be put forward until the complete
anode is exhausted. Operating Si–air cells with alkaline
electrolyte causes substantial corrosion, which produces
also hydrogen gas as a reaction product. Moreover, along
with the dissolution of Si in KOH, condensation of silicate
structures in the electrolyte has been observed. Both
effects accelerate electrolyte loss in the cell. Therefore,
appropriately balancing the electrolyte supply of the
Si–air cell is a precondition for ongoing discharge.
Specifically, cells with As-doped Si-wafer anodes with 0.6
mm and 3.0 mm thickness were discharged in 5 M KOH
electrolyte at current densities up to 0.05 mA/cm2 for 260
and 1100 hours, respectively. The drawback is that a minimum
amount of electrolyte is required in order not to exceed 4 M
Si content, which otherwise leads to a gelation of the
electrolyte. Although a considerable fraction of the anode
material is not transformed to electrical energy owing to
corrosion, specific energies up to 140 Wh/kg (for 1100 h)
related to the total anode mass loss were realized.},
cin = {IEK-9},
ddc = {540},
cid = {I:(DE-Juel1)IEK-9-20110218},
pnm = {131 - Electrochemical Storage (POF3-131) / HITEC -
Helmholtz Interdisciplinary Doctoral Training in Energy and
Climate Research (HITEC) (HITEC-20170406)},
pid = {G:(DE-HGF)POF3-131 / G:(DE-Juel1)HITEC-20170406},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000393502500024},
doi = {10.1016/j.electacta.2016.12.120},
url = {https://juser.fz-juelich.de/record/826404},
}